The Sirio CX-4-73 is a base antenna, this one is designed to work between 73 and 78MHz.

Key Features:

• Base station antenna, Mono-band
• Low-gain, Omnidirectional
• Protection from static discharges DC-Ground
• Made of aluminium alloy 6063 T-832

Electronic Data:

• Type: 3/4λ coaxial J-pole
• Frequency range: tunable 73...78 MHz
• Impedance: 50Ω
• Radiation (H-plane): 360° omnidirectional
• Radiation (E-plane): beamwidth @ -3 dB = 60°
• Radiation angle: 3°
• Polarization: linear vertical
• Gain: 2dBd - 4.15 dBi
• Bandwidth @ SWR ≤1.5: CX 4-73: ≥ 2.0 MHz @ 73 MHz
• SWR. @ res. freq.: ≤ 1.2
• Max. Power (CW) @ 30°C: 500 Watts
• Grounding protection: All metal parts are DC-grounded, the inner conductor shows a DC short
• Connector: UHF-female

Mechanical Data:

• Materials: Aluminium, Brass, Stainless Steel, Nylon
• Wind load / resistance: 97 N @ 150 Km/h / 150 Km/h
• Wind surface: 0.08 m²
• Height (approx.): from 2700 to 3360 mm
• Weight (approx.): 1900 gr
• Mounting mast: Ø 35-42 mm